JP3585868B2 - Clutch outer - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention has a cylindrical portion and an end wall portion connected to one end of the cylindrical portion, which is integrally formed by die-casting, and a plurality of portions at equal intervals in a circumferential direction of the cylindrical portion have one end connected to the end. A slit is formed at the portion close to the wall portion, and the other end is opened at the other end of the cylindrical portion, and a slit extending in the axial direction of the cylindrical portion is formed. And, more particularly, to an improvement in the shape of the slit.
[0002]
[Prior art]
Conventionally, such a clutch outer is already known, for example, from Japanese Patent No. 3120291, and a slit is formed at a plurality of positions in a circumferential direction of the cylindrical portion of the cylindrical portion of the cylindrical portion with the same width on the inner circumferential side and the outer circumferential side. Is formed.
[0003]
[Problems to be solved by the invention]
In a multi-plate clutch using such a clutch outer, it is desirable to reduce costs by forming a plurality of friction plates with an inexpensive thin iron plate, and to reduce the number of friction plates to reduce the size and weight. Therefore, it is necessary to reduce the contact surface pressure between the engaging claw of the friction plate and the clutch outer in which the engaging claw is engaged with the slit. It is necessary to reduce the interval along the circumferential direction as much as possible to increase the number of slits as much as possible.
[0004]
By the way, in die-casting the clutch outer, a portion forming each slit is provided in one of a mold forming the inner surface side and a mold forming the outer surface side of the clutch outer, and a mold dividing surface in each slit is provided. Is set at a position flush with the outer peripheral surface or inner peripheral surface of the cylindrical portion, but in the above-described conventional device, if the number of slits is large, the draft of each slit should be set small. In order to prevent the occurrence of galling, the draft angle of each slit is set to a large value because the resistance when the mold is opened becomes large and the product is likely to be galled at a portion corresponding to the mold dividing surface. There is a need to.
[0005]
However, when the draft angle of the slit becomes large, a relatively large difference between the width of one end of the slit on one end side of the cylindrical portion, that is, the end wall portion, and the width of the other end of the slit on the other end side of the cylindrical portion is obtained. And the possibility of malfunction of the friction plate may occur at one end of the narrow slit, whereas the engaging claw of the friction plate moves within the slit at the other end of the wide slit. There is a possibility that a hitting sound is generated.
[0006]
The present invention has been made in view of the above circumstances, and it is possible to set the number of slits as large as possible while preventing the product from galling and also preventing occurrence of a tapping sound. It is an object of the present invention to provide such a clutch outer.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention relates to a plurality of cylindrical parts, which are integrally formed with a cylindrical part and an end wall part connected to one end of the cylindrical part, and are formed at equal intervals in a circumferential direction of the cylindrical part. At the location, one end is closed at a portion close to the end wall portion, and the other end is opened at the other end of the cylindrical portion, and a slit extending in the axial direction of the cylindrical portion is formed. In the clutch outer in which the engaging claws on the outer periphery of the friction plate are slidably engaged, the slits are formed on the inner peripheral side of the cylindrical portion, and the wide portions are engaged with the engaging claws. A narrow portion formed on the outer peripheral side of the cylindrical portion by making the width along the circumferential direction of the cylindrical portion smaller than the wide portion is continuously provided via a step facing the radially inward of the cylindrical portion. The draft of the wide portion at the time of die casting is smaller than the draft of the narrow portion. It is a constant, characterized in that the mold parting plane during die casting is set on the outer peripheral side of the cylindrical portion.
[0008]
According to such a configuration, each slit is formed in a stepped shape in which the inner peripheral side of the cylindrical portion is wide, and the draft of the narrow portion on the mold dividing surface side is set relatively large. As a result, it is possible to prevent the product from galling at the time of separating the product when the mold is opened, and to reduce the draft angle of the wide portion where the engaging claws of the plurality of friction plates are engaged relatively small. By setting, it is possible to prevent the malfunction of the friction plate from occurring and the occurrence of a tapping sound. This makes it possible to set the number of slits as large as possible, to reduce the contact surface pressure between the engagement claws of the friction plates and the clutch outer, and to reduce costs by forming each friction plate with an inexpensive thin iron plate. It is possible to reduce the number of friction plates to reduce the size and weight.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described based on an embodiment of the present invention shown in the attached drawings.
[0010]
1 to 5 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a wet multi-plate clutch, and FIG. 2 is a longitudinal sectional view of a clutch outer, taken along line 2-2 in FIG. FIG. 3 is a view taken in the direction of the arrow 3 in FIG. 2, FIG. 4 is an enlarged view taken in the direction of the arrow 4 in FIG. 3, and FIG.
[0011]
First, in FIG. 1, this wet multi-plate clutch is provided on an input shaft 11 of a transmission of a motorcycle, for example, and is engaged with a drive gear 12 fixed to a crankshaft of an engine. , A clutch center 14 fixed to the input shaft 11, a clutch outer 15 disposed between the clutch center 14 and the driven gear 13 so as to surround the clutch center 14, , A plurality of drive friction plates 17 engaged with the inner peripheral side of the clutch outer 15 so as to be slidable in the axial direction, and these drive friction plates 17 A plurality of driven friction plates which are arranged so as to be alternately overlapped with each other and which can slide in the axial direction and are engaged with the outer peripheral side of the clutch center 14 And a 8.
[0012]
The driven gear 13 has a cylindrical support cylinder 13a on the inner periphery thereof, and the support cylinder 13a is supported on the input shaft 11 via a needle bearing 19. The boss 14a of the clutch center 14 is spline-coupled to the input shaft 11 with a thrust washer 20 interposed between the boss 14a and the support cylinder portion 13a. The washer 21 abuts on the boss 14a on the opposite side to the thrust washer 20. Then, a nut 22 screwed to the end of the input shaft 11 is engaged. An end plate 23 is in contact with the annular shoulder 11 a of the input shaft 11, and the support cylindrical portion 13 a of the driven gear 13 is sandwiched between the end plate 23 and the thrust washer 20.
[0013]
2 and 3, the clutch outer 15 includes a cylindrical portion 15a coaxially surrounding the clutch center 14, and an end wall portion 15b connected to one end of the cylindrical portion 15a and facing the driven gear 13. And formed integrally by die casting of a light alloy such as an aluminum alloy.
[0014]
In the end wall portion 15b, a through-hole 24 is provided at a central portion through which the support cylindrical portion 13a of the driven gear 13 is inserted, and a plurality of connection bosses 25 respectively passing through a plurality of damper rubbers 16 attached to the driven gear 13 are provided. ... are protruded integrally. On the other hand, a retainer plate 26 sandwiching each of the damper rubbers 16 with the end wall portion 15b is fixed to a distal end surface of each of the connection bosses 25 with rivets 27.
[0015]
On the other hand, the clutch center 14 is integrally provided with a pressure receiving plate 28 that faces the outermost driving friction plate 17 on the open end side of the clutch outer 15. A pressure plate 29 capable of pressing the dynamic friction plate 18 is arranged to face the drive friction plate 17 located on the innermost side of the clutch outer 15. A plurality of support shafts 30 penetrating through the clutch center 14 at a plurality of locations are integrally provided on the pressure plate 29, and a release plate 31 is fixed to a tip of each support shaft 30 by bolts 32. . Between the release plate 31 and the clutch center 14, coil-shaped clutch springs 33 for urging the pressure plate 29 toward the pressure receiving plate 28 with a predetermined set load are contracted.
[0016]
A bearing holder 35 for fitting an outer ring of a release bearing 34 is attached to the release plate 31, and a release rod 36 is fitted to an inner ring of the release bearing 34.
[0017]
Referring also to FIG. 4, each of the driving friction plates 17 is provided with engaging claws 17 a... Provided on the outer periphery of the cylindrical portion 15 a of the clutch outer 15 at a plurality of equally spaced positions in the circumferential direction. There are formed slits 38 which are slidably engaged in the axial direction.
[0018]
These slits 38 are formed so that one end is closed at a portion near the end wall portion 15b and the other end is opened at the other end of the cylindrical portion 15a so as to extend in the axial direction of the cylindrical portion 15a. The wide portion 38a formed on the inner peripheral side of the portion 15a and the narrow portion 38b formed on the outer peripheral side of the cylindrical portion 15a by making the width along the circumferential direction of the cylindrical portion 15a smaller than the wide portion 38b. And a step portion 38c facing inward in the radial direction of the cylindrical portion 15a. The wide portion 38a engages with the engaging claw 17a, and the cross section of the wide portion 38a is formed, for example, in a trapezoidal shape corresponding to the engaging claw 17a.
[0019]
As shown in FIG. 5, the die casting of the clutch outer 15 includes a die 39 forming the inner surface of the clutch outer 15 and a die 40 forming the outer surface of the clutch outer 15. A slit forming portion 39a for forming each of the slits 38 is integrally provided in the mold 39 that forms the inner surface side of the clutch outer 15 among the two molds 39 and 40. The mold dividing surfaces 41 of the molds 39 and 40 are set on the outer peripheral side of the cylindrical portion 15a of the clutch outer 15.
[0020]
In such a die casting apparatus, when the mold is opened, the two molds 39 and 40 are separated from each other in the axial direction of the clutch outer 15, and in order to pull out the slit forming portions 39a. The draft of the wide portion 38a of the slit 38 is set smaller than the draft of the narrow portion 38b. That is, when the width of one end of the wide portion 38a is WA1, the width of the other end of the wide portion 38a is WA2, the width of one end of the narrow portion 38b is WB1, and the width of the other end of the narrow portion 38b is WB2, (WA2-WA1) <(WB2-WB1), for example, while (WA2-WA1) is 0.2 mm, (WB2-WB1) is, for example, 0.8 mm.
[0021]
Next, the operation of this embodiment will be described. A plurality of slits 38 for engaging the engaging claws 17a provided on the outer periphery of the plurality of driving friction plates 17 slidably in the axial direction are formed in the clutch outer 15. The slits 38 are formed at positions equidistant in the circumferential direction of the cylindrical portion 15a, and the slits 38 are formed on the inner peripheral side of the cylindrical portion 15a, and the wide portions 38a with which the engaging claws 17a are engaged. And a narrow portion 38b formed on the outer peripheral side of the cylindrical portion 15a by making the width of the cylindrical portion 15a along the circumferential direction smaller than the wide portion 38a faces radially inward of the cylindrical portion 15a. Are provided continuously via the step portions 38c. That is, each of the slits 38 is formed in a stepped shape in which the inner peripheral side of the cylindrical portion 15a is wide.
[0022]
In addition, the draft of the wide portions 38a at the time of die-casting the clutch outer is set to be smaller than the draft of the narrow portions 38b, and the mold dividing surfaces 41 of the dies 39 and 40 at the time of die-casting are cylindrical. It is set on the outer peripheral side of the portion 15a.
[0023]
Therefore, the draft of the narrow portion 38b located on the mold dividing surface 41 side of the slit 38 is set to be relatively large, and the product seizes at the time of separating the products when the molds 39 and 40 are opened. This can be prevented as much as possible. Further, the draft of the wide portions 38a for engaging the engaging claws 17a of the plurality of driving friction plates 17 is set to be relatively small. Generation of sound can be prevented.
[0024]
Thereby, the number of the slits 38 can be set as large as possible, and the contact surface pressure of the engagement claws 17a of the driving friction plates 17 and the clutch outer 15 can be suppressed to be small. Thus, in the wet multi-plate clutch for a motorcycle, the driving friction plates 17 are formed of an inexpensive thin iron plate to reduce the cost, and the number of the driving friction plates 17 and the driven friction plates 18 is reduced. As a result, it is possible to reduce the size and weight.
[0025]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.
[0026]
For example, in the above-described embodiment, a case has been described in which the present invention is applied to a wet multi-plate clutch for a motorcycle. However, the present invention can be applied to a clutch in an automatic transmission of a four-wheeled vehicle. In this case, an iron friction plate is conventionally used, but by setting the number of slits as large as possible to reduce the contact surface pressure of the engagement claws of the drive friction plate and the clutch outer, the drive friction plate and It is possible to make the driven friction plate thinner to achieve compactness and light weight.
[0027]
【The invention's effect】
As described above, according to the present invention, it is possible to prevent the occurrence of galling of the product when separating the product when the mold is opened, and to prevent the malfunction of the friction plate or the occurrence of a tapping sound. As a result, the number of slits can be set as large as possible. Thus, for example, in a clutch for a motorcycle, each friction plate can be formed of an inexpensive thin iron plate to reduce the cost, and a clutch that conventionally uses an iron friction plate, for example, an automatic transmission of a four-wheeled vehicle It is possible to make the friction plate thinner to reduce the size and weight of the clutch.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a wet multi-plate clutch.
FIG. 2 is a longitudinal sectional view of the clutch outer, which is a sectional view taken along line 2-2 of FIG. 3;
FIG. 3 is a view as viewed in the direction of arrow 3 in FIG. 2;
FIG. 4 is an enlarged view of FIG.
FIG. 5 is a longitudinal sectional view of the die casting apparatus in a state where the die casting is completed.
[Explanation of symbols]
15 clutch outer 15a cylindrical part 15b end wall part 17 friction plate 17a engaging claw 38 slit 38a wide part 38b narrow part 38c: Step portion 41: Mold dividing surface

Claims (1)

A plurality of cylindrical parts (15a) and an end wall part (15b) connected to one end of the cylindrical parts (15a) are integrally formed by die-casting, and are equally spaced in a circumferential direction of the cylindrical parts (15a). A slit (38) which closes one end at a portion near the end wall (15b) and opens the other end to the other end of the cylindrical portion (15a) and extends in the axial direction of the cylindrical portion (15a). Is formed, and in each of the clutch outers in which the engaging claws (17a) on the outer periphery of the plurality of friction plates (17) are slidably engaged with the respective slits (38), the respective slits (38) A wide portion (38a) formed on the inner peripheral side of the cylindrical portion (15a) and to which the engaging claw (17a) is engaged; and a wide portion along the circumferential direction of the cylindrical portion (15a). 38a) to be smaller than the outer diameter of the cylindrical portion (15a). (38b) and a step (38c) facing inward in the radial direction of the cylindrical portion (15a), and the draft of the wide portion (38a) at the time of die casting is reduced to the narrow width. A clutch outer, wherein the draft is set smaller than a draft angle of the portion (38b), and a mold dividing surface (41) at the time of die casting is set on an outer peripheral side of the cylindrical portion (15a).

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